How can I assign the new variables with base variables?

I am using app funtion to detect object.

Now I want to assign the object detected as a new variable to find its information in EXCEL.

I succesfully to detect the object by using the button pushed function of 'scanbutton'

but I do not know how to assign the object dected to the second button.

For example, I detect orange, and I want to know its calories by just click the nutrients&calories button. When I click the the'nutrients&calories', it will find its name in the first column, and read it calories from second column.

The detect object is a variable, it can be any things, just like orange, apple, pizza or any other things. Now what I can do is to read the infor of the given name, how can get the infor is the thing is a varibale?

 % Properties that correspond to app components
    properties (Access = public)
        UIFigure                 matlab.ui.Figure
        SCANButton               matlab.ui.control.Button
        NutrientsCaloriesButton  matlab.ui.control.Button
        Label                    matlab.ui.control.Label
        Label2                   matlab.ui.control.Label
        UIAxes                   matlab.ui.control.UIAxes
    end
 
    
    properties (Access = private)
        Property
        vidObj;
        net;
        inputsize;
        newing;
        CName; % Description
        CName1; % Description
    end
    
 
    % Callbacks that handle component events
    methods (Access = private)
 
        % Code that executes after component creation
        function startupFcn(app)
            app.net=googlenet; 
            app.inputsize=app.net.Layers(1).InputSize;
            
            app.vidObj=videoinput('macvideo');
            preview(app.vidObj);
        end
 
        % Button pushed function: SCANButton
        function SCANButtonPushed(app, event)
            img=getsnapshot(app.vidObj);
            img=ycbcr2rgb(img);
            image(img,'Parent',app.UIAxes);
            
            app.newing=imresize(img,app.inputsize(1:2));
            app.CName=classify(app.net,app.newing);
            
            CName0=char(app.CName);
            
            system(sprintf('say %s', CName0));
            
            app.Label.Text=app.CName;
        end
 
        % Button pushed function: NutrientsCaloriesButton
        function NutrientsCaloriesButtonPushed(app, event)
           FoodTable = readtable('foods.xlsx'); 
 
           % Find all the rows that are the orange
           app.CName = FoodTable(strcmp(FoodTable.Name, app.CName), :);
           
 
           % Show the calories
           fprintf(" CName has %d calories\n", app.CName1.Calories);
           
        end
    end
 
    % Component initialization
    methods (Access = private)
 
        % Create UIFigure and components
        function createComponents(app)
 
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Color = [0.9294 0.6941 0.1255];
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';
 
            % Create SCANButton
            app.SCANButton = uibutton(app.UIFigure, 'push');
            app.SCANButton.ButtonPushedFcn = createCallbackFcn(app, @SCANButtonPushed, true);
            app.SCANButton.BackgroundColor = [0.651 0.651 0.651];
            app.SCANButton.FontColor = [0.149 0.149 0.149];
            app.SCANButton.Position = [148 432 100 22];
            app.SCANButton.Text = 'SCAN';
 
            % Create NutrientsCaloriesButton
            app.NutrientsCaloriesButton = uibutton(app.UIFigure, 'push');
            app.NutrientsCaloriesButton.ButtonPushedFcn = createCallbackFcn(app, @NutrientsCaloriesButtonPushed, true);
            app.NutrientsCaloriesButton.BackgroundColor = [0.651 0.651 0.651];
            app.NutrientsCaloriesButton.FontColor = [0.149 0.149 0.149];
            app.NutrientsCaloriesButton.Position = [126 50 122 22];
            app.NutrientsCaloriesButton.Text = 'Nutrients & Calories';
 
            % Create Label
            app.Label = uilabel(app.UIFigure);
            app.Label.Position = [381 415 89 56];
 
            % Create Label2
            app.Label2 = uilabel(app.UIFigure);
            app.Label2.Position = [381 50 42 22];
            app.Label2.Text = 'Label2';
 
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Picture of food')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.Position = [37 107 548 300];
 
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
 
    % App creation and deletion
    methods (Access = public)
 
        % Construct app
        function app = sreen3_2_exported
 
            % Create UIFigure and components
            createComponents(app)
 
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
 
            % Execute the startup function
            runStartupFcn(app, @startupFcn)
 
            if nargout == 0
                clear app
            end
        end
 
        % Code that executes before app deletion
        function delete(app)
 
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
    end

Answer 1

[Sourabh Kondapaka]

Hi @Xingmin LI,

Some of the changes you can do are:

• Have a variable called 'detectedObj'. In your case CName0 represents the same thing. You need to assign the return value of classify() function as :

%By assigning it to a class variable, it will be accessible across all functions defined within the class.
app.detectedObj = classify(app.net,app.newing);

• Because of the first point as stated above, in NutrientsCaloriesButtonPushed() function, you can now access the variable by app.detectedObj for the detected object. But you have to ensure that NutrientsColories Button is only clicked after SCANButton is clicked.
• Read the excel sheet in the startUpFn of the app and store it in a variable. (This will save computation time when the excel sheet grows larger in size)

I would suggest you to go through the documentation to learn more about App Designer